I've had pretty good success with Cyberpowerinc.com as well. They have decent prices, although the newer graphics card back-orders make it somewhat of a pain to order right now. I spent $1889 on my new rig from them, including shipping. They have some issues with customer service sometime, but they offer a 3 year limted warranty and lifetime tech support. I sugguest if you're going to get an AMD build, go with the Gamer 8800 configurator. It offers Windows 7 free so that'll save you a good $130. This is the rig I ordered, albeit the price has gone up since I bought it.
*BASE_PRICE: [+785] 
BUNDLE: None 
BLUETOOTH: None 
CD: LG 22X DVD±R/±RW + CD-R/RW Dual Layer Drive (BLACK COLOR) 
CD2: None 
CAS: SilverStone/Raven RV01B-W Black Color Full Tower Case w/ Side See-Thru Window [+103] 
CASUPGRADE: None 
CS_FAN: Default case fans 
CPU: AMD Phenom™II X4 965 Black Edition Quad-Core CPU w/ HyperTransport Technology [+54] 
CARE1: CoolerMaster Thermal Fusion 400 Extreme Performance CPU - Thermal Compound Optimized for Thermal Dissipation [+10] 
FLOPPY: None 
FREEBIE_OS: None 
FAN: Ultra ChillTec Thermo Electric CPU Cooler (Venom Boost Extreme OC Certified) [+120] 
FREEBIE_RM: None 
FREEGAME_VC02: None 
FA_HDD: None 
FLASHMEDIA: INTERNAL 12in1 Flash Media Reader/Writer (BLACK COLOR) 
HDD: Extreme Performance (RAID-0) with 2 Identical Hard Drives [+11] (1TB (500GBx2) SATA-II 3.0Gb/s 16MB Cache 7200RPM HDD [+20]) 
HDD2: Single Hard Drive [+47] (1TB (1TBx1) SATA-II 3.0Gb/s 16MB Cache 7200RPM HDD [+36]) 
IEEE_CARD: None 
KEYBOARD: None [-4] 
MOUSE: Razer Naga MMOG 5600 DPI Gaming Mouse [+64] 
MODEM: None 
MULTIVIEW: Non-SLI/Non-CrossFireX Mode Supports Multiple Monitors 
MONITOR: None 
MONITOR2: None 
MOTHERBOARD: GigaByte MA790FXT-UD5P AM3 DDR3 790FX CrossFire Chipset with Quad PCIE slot SATA RAID MB w/GbLAN [+90] 
MEMORY: 8GB (2GBx4) DDR3/1600MHz Dual Channel Memory Module [+169] (Corsair Dominator [+108]) 
NETWORK: Onboard Gigabit LAN Network 
OS: Microsoft® Windows® 7 Home Premium (64-bit Edition) 
OS_UPGRADE: None 
PRINTER: None 
PRINTER_CABLE: None 
POWERSUPPLY: Corsair Power Supplies [+64] (750 Watts CMPSU-750TX - Quad SLI Ready [+8]) 
RUSH: NO; READY TO SHIP IN 5~10 BUSINESS DAYS 
SERVICE: STANDARD WARRANTY: 3-YEAR LIMITED WARRANTY PLUS LIFE-TIME TECHNICAL SUPPORT 
SOUND: HIGH DEFINITION ON-BOARD 7.1 AUDIO 
SPEAKERS: None [-5] 
TEMP: None 
TVRC: None 
USB: Built-in USB 2.0 Ports 
USBHD: None 
VIDEOCAMERA: None 
VIDEO: ATI Radeon HD 5870 PCI-E 16X 1GB DDR5 Video Card [DirectX 11 Support] [+385] (Major Brand Powered by ATI) 
VIDEO2: None 
VC_PHYSX: None 
WNC: PCI Wireless 802.11g 54Mbps Network Interface Card 
_PRICE: (+2065) 
I researched every part before I placed the order. Also, if you put in the promo code REPEAT you get a 5% discount  

 Take a look there and see whatca think!